1. IOR/V/19/243 Reference (shelfmark): IOR/V/19/243 Title: Survey of India Departmental Paper No. 6, Note on the measure of precision of levelling and proposal for the creation of a new category of levelling to be called levelling of high precision. C. Lallemand, transl. J. de Graaf Hunter. Dehra Dun, 1914 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1914 Extent: 1 volume